Abbreviations
Vallisneria natans (Lour.) Hara , V. natans ; organic matter, OM; total nitrogen, TN; ammonia nitrogen, NH4+-N; total phosphorus, TP; control group, CK; maifanite, ME; vermiculite, VE; ceramsite, CE; volcanic rock gravels, VR; chlorophyll, Chl; malondialdehyde, MDA; superoxide dismutase, SOD; catalase, CAT; triphenyl tetrazo - lium chloride, TTC; Detrended correspondence analysis, DCA; redundancy analysis, RDA;